Trans-fat ban could bring unintended consequences New York City has mandated that all of its restaurants will be frying foods only in trans-fat-free oils. The idea seems very enticing since consumption of trans fats, or partially hydrogenated oils has been linked to long-term heart problems. Therefore it seems the logical alternative is to use unsaturated oils. This seems to be true for unheated margarines and salad dressings. However, when the oils are used in frying operations, another picture emerges. It seems these unsaturated oils are prone to random oxidation, producing a plethora of oxidation products. Many of these are reported to be quite toxic. In the book “Symposium on Foods: Lipids and Their Oxidation,” published way back in 1962, there is an entire chapter devoted to the toxicity of heated fats and oils. There are many examples of this toxicity. Here are two: Control rats fed a diet containing 20% corn oil thrived and were normal in very respect. Test rats fed the same die...
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